ATMEGA640 datasheet(434/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

2549Q–AVR–02/2014

28.4Boundary-scan Specific JTAG Instructions .........................................................297

28.5Boundary-scan Chain ..........................................................................................298

28.6Boundary-scan Related Register in I/O Memory .................................................301

28.7ATmega640/1280/1281/2560/2561 Boundary-scan Order ..................................301

28.8Boundary-scan Description Language Files ........................................................301

29 Boot Loader Support – Read-While-Write Self-Programming ......... 310

29.1Features ..............................................................................................................310

29.2Application and Boot Loader Flash Sections .......................................................310

29.3Read-While-Write and No Read-While-Write Flash Sections ..............................310

29.4Boot Loader Lock Bits .........................................................................................312

29.5Addressing the Flash During Self-Programming .................................................314

29.6Self-Programming the Flash ................................................................................315

29.7Register Description ............................................................................................323

30 Memory Programming ......................................................................... 325

30.1Program And Data Memory Lock Bits .................................................................325

30.2Fuse Bits ..............................................................................................................326

30.3Signature Bytes ...................................................................................................328

30.4Calibration Byte ...................................................................................................328

30.5Page Size ............................................................................................................328

30.6Parallel Programming Parameters, Pin Mapping, and Commands .....................328

30.7Parallel Programming ..........................................................................................330

30.8Serial Downloading ..............................................................................................338

30.9Programming via the JTAG Interface ..................................................................342

31 Electrical Characteristics .................................................................... 355

31.1DC Characteristics ...............................................................................................355

31.2Speed Grades .....................................................................................................357

31.3Clock Characteristics ...........................................................................................359

31.4External Clock Drive ............................................................................................359

31.5System and Reset Characteristics ......................................................................360

31.62-wire Serial Interface Characteristics .................................................................361

31.7SPI Timing Characteristics ..................................................................................363

31.8ADC Characteristics – Preliminary Data ..............................................................365

31.9External Data Memory Timing .............................................................................367

32 Typical Characteristics ........................................................................ 373

32.1Active Supply Current ..........................................................................................373

ATMEGA640 Datasheet(PDF) 434 Page - Microchip Technology